The total volume of hydrogen gas produced by the reaction is 8.4 cm 3 .Calculate the number of moles of hydrogen gas in 8.4 cm 3 .The molar gas volume at 25 °C is 24 dm 3 .Show your working.number of moles = .......................................................... [2](ii) The experiment is repeated at a temperature of 10 °C.State how reducing the temperature affects the rate of reaction.Explain your answer in terms of collisions between particles........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ [3][Total: 10]
Question
The total volume of hydrogen gas produced by the reaction is 8.4 cm 3 .Calculate the number of moles of hydrogen gas in 8.4 cm 3 .The molar gas volume at 25 °C is 24 dm 3 .Show your working.number of moles = .......................................................... 2 The experiment is repeated at a temperature of 10 °C.State how reducing the temperature affects the rate of reaction.Explain your answer in terms of collisions between particles........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ [3][Total: 10]
Solution
(i) To calculate the number of moles of hydrogen gas, we need to use the formula:
Number of moles = Volume of gas / Molar volume of gas
First, we need to convert the volume from cm^3 to dm^3.
1 dm^3 = 1000 cm^3
So, 8.4 cm^3 = 8.4 / 1000 = 0.0084 dm^3
Now we can substitute the values into the formula:
Number of moles = 0.0084 dm^3 / 24 dm^3 = 0.00035 moles
(ii) Reducing the temperature will decrease the rate of reaction. This is because the particles will have less kinetic energy, which means they will move slower. As a result, there will be fewer collisions between particles per unit of time. Furthermore, the collisions that do occur are less likely to have enough energy to overcome the activation energy of the reaction, leading to fewer successful reactions.
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